<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        div>label{
            color: red;
        }
    </style>
</head>
<body>
<div>
    <p>
        我是p标签
        <span>
            我是span
            <b>
                我是b标签
                <i>我是i标签</i>
            </b>
        </span>

        <label>我是p儿子的label标签</label>
    </p>
    <label>我是p同级的label标签</label>
</div>
</body>
</html>